Gas-engine.



10.687,678. Patented Nov. ze, 190|.l

M. E. DURMAN.

GAS ENGINE.

(Application'led Apr. 27, 1901.) (No Modal.)

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UNITED STATES PATENT rrrcn..

GAS-ENGINE.

SPEGEFLCATION forming part of Letters Patent No. 687,678, dated November 26, 1901. Application filed April 27, 1901. Serial No. 57,746. (No model.)

To all whom, t may concern:

Be it known that I, MICHAEL E. DURMAN, a citizen of the United States, residing at Woodmere, in the county of Wayne and State of Michigan, have invented certain new and use- In the drawings, Figure 1 is a vertical cen-` tral section through the engine.` Fig. 2 is a section at righ-t angles to Fig. 1; and Fig. 3 is a section on line x, Fig. 2.

The reference-letter A designates the basesection or supporting-frame of the engine,

formed in two sections B and C, spaced froml each other, as shown.

C designates the cylinder arranged upon the base, and D is the Water-jacket surrounding the cylinder, as shown.

E and E' designate pistons Working within 1 the cylinder ends and forming between them the explosion-chamber F F are the piston-rods, extending in opposite directions through the cylinder-heads. y

G designates across-head secured to the rod F", Which slides in guides H, formed upon the inner faces of the sections B and C. I designates a similar cross-head sliding in guides J, mounted upon the cylinder top. The pistonrod F is connected to the cross-head I, as indicated, and, as shown, each cross-head is provided with a laterally-extending arm K for the purpose hereinafter set forth.

The opposite Walls of the cylinder and water-jacket are centrally apertured, as indicated in Fig. 1, to permit of the insertion of the engine-shaft L therethrough. The portion otthe Walls around each aperture is internally screw-threaded, and a bushing M 0f alength` equal to the diameter of the jacket extends through the latter.

are formed upon the opposite ends of the bushing, Which engage the threads on the Walls about the apertures.

O O are bracket-arms secured upon opposite sides of the cylinder and extending in opposite directions, as indicated. Each arm Screw-threads t at its free end carries a tubular bearing P, .which bearings are in alinement with the bushing to receive the shaft.

Q designates the balance-wheel on one of the shaft ends, and R is the usual band-Wheel upon the opposite end.

S designates oppositely-extending cranks upon .the shaft on either side of the casing, and T represents connecting-rods which secure the cranks to the arms K upon the crossheads, as shown iu Fig. l. Arranged upon one side of the cylinder and communicating with the explosionchamber isavalve-chestT',havingoppositely-arranged tubular portions U, formed of fittings, as shown. The valve-chest is provided with an inlet-port a and an exhaust-port b, arranged opposite each other, as plainly shown in Fig. 1.

c and d are spring-actuated Valves controlling the ports, provided with stems e, which project through the tubular portions. of the valve-chest and terminate in heads f.

g designates stuffing-boxes closing the ends of the tubular portions and through which the Valve-stems project.

h designates springs arranged intermediate the stem-heads and stutng-boxes, forming the means for normally holding the Valves to their seats.

V designates an exhaustpipe communicating with the exhaust-port, and W is a supplypipe which receives a mixture of gasolene and air from a suitable carburetor. (Not shown.) As illustrated, the supply-pipe is branched, one member X communicating with an inletport a', formed within one end of the cylinder, and the other member Y communicating With the interior of the cylinder at its opposite end through an inlet-port b.

Y is a connection between the branch Y andthe valvechest, establishing communication between the supply-pipe and the valvecon'trolled inlet-port.

Z designates a check-valve located in the supply-pipe.

Mounted for reciprocating movementin guides c' upon the side of the cylinder' opposite to the valve-chest is a rod A, which carries thereon a striker B', preferably adjustably secured to the rod, as shown.

C2 is a connection between the upper end of the rod and the upper cross-head, whereby reciprocating motion is imparted to the striker.

D is a lever pivoted to the cylinder adjacent to the Valve-chest and above the same. One arm E2 of this lever extends normally slightly above the headfof the exhaust-valve stem, while the opposite lever-arm C3 is semicircular in congu ration, extending about the cylinder, as shown, and having its free end arranged in the path of the striker B'.

Upon the outward movement ofthe pistons the lever is operated and the valve c raised from its seat. Upon the return movement of the pistons the lever falls to its normal position and is maintained in operative relation to the valve-stem by a piu or support a2. During the return movement the striker is inoperative, it being adapted to slide over the end ot' the lever instead of operating the same.

In operation the charge within the explosion-chamber being ignited by suitable mechanism the pistons are driven in opposite directions, and during the outward movement ofthe upper piston the valve c is raised from its seat, allowing the products of explosion to exhaust through the exhaust-port. During the movement ot the pistons vcaused by the explosion the mixed oil and air intermediate the pistons and the cylinder ends and in the supply-pipe is compressed, the escape ofthe mixt-ure back to the earbureter being prevented by the check-valve Z. As soon as the pistons are at the limit ot' their outward movement the compression of the mixture is sufficient to overcome the tension of the spring holding the inlet-valve CZ to its seat and a charge is admitted to the explosionchamber E2. Upon the return movement of the pistons the charge is compressed and subsequently exploded, as above set forth, and thus the desired rotary movement; is imparted to the shaft.

What I claim as my invention is l. In a gas or gasolene engine, the combination with the cylinder having a central and end ports formed therein, of the pistons sliding within the cylinder ends and forming between them an explosion-chamber, a valvechest beside the cylinderhaving Valve-controlled inlet and exhaust ports formed therein, and communicating through the central port in the cylinder with the explosion-chamber, a supply-pipe communicating with the end ports in the cylinder and with the inlet-port in the valve-chest, and means controlled by one of the pistons for operatingthe exhaustport valve at each revolution ofthe shaft.

2. In a gas-engine, the combination with a vertical cylinder and a water-jacket surrounding the same, the opposite walls ot the cylinder and jacket being centrally apertured and internally screw-threaded, as shown, a bushing extending through the cylinder and jacket, the ends thereof being threaded and between the cross-heads and the cranks, substantiall y as described.

3. In a gas-engine, the combination with the cylinder having two pistons therein, the piston-rods extending in opposite directions through the cylinder-heads, of a valve-chest beside the cylinder provided with inlet and exhaustports and colnmunicatingwith the interior of the cylinder, spring-actuated valves controlling the ports, a stem for the exhaustport valve extending through and beyond the valve-chest, a reciprocating rod actuated by one of the pistons, a striker on the rod, and a pivotally-supported lever having one of its ends extending in proximity to the exhaustport valve and its opposite end arranged in the path of the striker.V

4:. In a gas-engine, the combination with the cylinder having two pistons therein, the piston-rods extending in'opposite directions through the cylinder-heads, of a valve-chest beside the cylinder provided with inlet and exhaustports and communicating with the interior of the cylinder, spring-actuated valves controlling the ports, a stern for the exhaustport valve extending through and beyond the valve-chest, a rod mounted for reciprocation in guides upon the side of the cylinder opposite to the valve-chest, a striker on said rod, a drive connection between one of the pistons and the rod, and a lever pivoted in proximity to the valve-chest, one of the lever-arms projecting in operative relation to the stem of the exhaust-port valve, and the complementary arm extending about the cylinder and into the path of the striker'.

In testimony whereof I afx my signature in presence of two witnesses.

MICHAEL E. DURMAN.

Vitnesses:

L. J. WHITTEMORE, HARRY C. SMITH.

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